In the following question, an idiom is given. It is then followed by three sentences which may or may not accurately represent the meaning of the idiom. Choose the best set of alternatives from the five options given below of the sentences which embody the meaning of the given idiom perfectly.

Burn one's boats

A. We had made a point of no return by declaring that we were not going to sign the agreement.

B. He breathed his last in the prime of his life.

C. The news her husband's death in the air crash came to her as a sudden or an unexpected shock.